> For the complete documentation index, see [llms.txt](https://yonda.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yonda.gitbook.io/docs/core-feauters/privacy-and-security.md).

# Privacy & Security

## Principles:

1. **Local Storage**:
   * Data stays on the user’s device.
   * Cloud sync with encryption.
2. **Encryption**:
   * End-to-end encryption for communications.
   * AES-256 for local storage.
3. **Access Control**:
   * Role-based permissions (admin, member, guest).
   * Two-factor authentication (2FA).

## Certifications:

* GDPR
* ISO 27001